public abstract class  Phone {
    public abstract void answer();
    public abstract void call();
}
class MIPhone extends Phone implements Smart{
    @Override
    public void answer() {
        System.out.println("正在接受电话");
    }

    @Override
    public void call() {
        System.out.println("正在拨打电话");
    }

    @Override
    public void takePhoto() {
        System.out.println("拍照");
    }

    @Override
    public void browse() {
        System.out.println("浏览网页");
    }
    public void MIUI(){
        System.out.println("正在使用澎湃OS系统");
    }
}
